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| Author(s): |
Murilo Eduardo Casteroba Bento
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Escola de Engenharia de São Carlos (EESC/SBD) |
| Defense date: | 2020-02-17 |
| Examining board members: |
Rodrigo Andrade Ramos;
Carolina de Mattos Affonso;
Luís Fernando Costa Alberto;
Francisco Damasceno Freitas;
João Alberto Passos Filho
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| Advisor: | Rodrigo Andrade Ramos |
| Abstract | |
In Power System (PS) Stability studies, the Voltage Stability Margin (VSM) is measured as the difference between the maximum load point (nose of PV curve and defined as Saddle-Node Bifurcation (SNB)) in a given load growth direction and the current load level. However, this margin may not adequately reflect the true loading limits of the system when oscillating instabilities are not considered due to Hopf Bifurcations (HB) (Loss of Small-Signal Stability). This occurs whenever these studies are performed on simplified static models that do not exhibit this kind of instability mechanism. Thus, studies considering only the simplified static modeling in the Voltage Stability (VS) analysis, although suitable for a portion of problems that may exist in an PS, are not applicable to another significant portion of this set of phenomena. Therefore, in view of this argument, this doctoral research proposes innovations in studies related to the stability of a PS, from two aspects. For this purpose one of the objectives of this research is to jointly evaluate the Voltage Stability Margins and the Small-Signal of a PS, from the development of a unified procedure. In other words, the proposal is to develop a method that can calculate a single stability margin that already includes SNB and HB in the dynamic security region. In addition, information on electrical quantities provided by selected buses that present Phasor Measurement Units will allow to monitor the PS and provide indications of suitability in the current estimate of the security margin cited for the current load growth direction. If a violation is identified, the load growth direction will be updated for the new power system scenario and a new security margin will be obtained. Developing a stability margin adequacy monitoring procedure as well as a load growth direction update procedure are also objectives of the doctoral research. This information will indicate the need to recalculate such a margin for a new operating scenario. (AU) | |
| FAPESP's process: | 15/24245-8 - Fast Method for Dynamic Security Analysis of Power System Considering Small-Signal and Voltage Stability |
| Grantee: | Murilo Eduardo Casteroba Bento |
| Support Opportunities: | Scholarships in Brazil - Doctorate |